﻿2 
  Howe: 
  Monospoeangial 
  discs 
  in 
  Liagora 
  

  

  procarps, 
  or 
  the 
  subsequent 
  cystocarps 
  may 
  nearly 
  always 
  be 
  

   found, 
  but 
  the 
  writer 
  in 
  examining 
  some 
  hundreds 
  of 
  specimens, 
  

   has 
  never 
  seen 
  anything 
  that 
  could 
  be 
  certainly 
  interpreted 
  as 
  

   tetrasporangia 
  or 
  as 
  a 
  non-sexual 
  alternating 
  generation. 
  In 
  the 
  

   older 
  systematic 
  works, 
  it 
  is 
  either 
  expressly 
  stated 
  that 
  tetra- 
  

   spores 
  in 
  the 
  genus 
  Liagora 
  are 
  unknown 
  or 
  else 
  silence 
  is 
  main- 
  

   tained 
  on 
  this 
  point. 
  In 
  Schmitz's 
  treatment 
  of 
  the 
  genus 
  in 
  

   Engler 
  & 
  Prantl, 
  Die 
  natiirlichen 
  Pflanzenfamilien, 
  we 
  find, 
  

   "Sporangien 
  ungenugend 
  bekannt, 
  angeblich 
  an 
  knotig 
  ver- 
  

   dickten 
  Stellen 
  der 
  oberen 
  Thalluszweige 
  aus 
  den 
  Endzellen 
  dcr 
  

  

  Rindfaden 
  entwlckelt 
  und 
  unregelmassig 
  paarig 
  geteilt." 
  De- 
  

   Toni, 
  in 
  his 
  Sylloge 
  Algarum, 
  appears 
  to 
  have 
  carried 
  this 
  state- 
  

   ment 
  over 
  into 
  Latin, 
  omitting, 
  however, 
  to 
  translate 
  the 
  "ange- 
  

   blich/* 
  Whether 
  this 
  statement 
  by 
  Schmitz 
  rests 
  upon 
  his 
  own 
  

  

  r 
  

  

  personal 
  observations 
  or 
  is 
  based 
  upon 
  some 
  previously 
  published 
  

   observation 
  that 
  has 
  escaped 
  the 
  attention 
  of 
  the 
  present 
  writer 
  

   is 
  not 
  clear. 
  Oltmanns, 
  in 
  his 
  Morphologie 
  und 
  Biologie 
  der 
  

   Algen, 
  is 
  apparently 
  silent 
  in 
  regard 
  to 
  this 
  matter. 
  

  

  In 
  Kiitzing's 
  Tabulae 
  Phycologicae 
  (8: 
  43. 
  pi. 
  go 
  I. 
  1858) 
  we 
  

   find 
  in 
  his 
  delineations 
  of 
  Liagora 
  Ttirneri 
  from 
  the 
  Red 
  Sea 
  a 
  

   figure 
  showing 
  "Ein 
  Gliederfaden, 
  dessen 
  eine 
  Zelle 
  sich 
  zu 
  einer 
  

   Brutzelle 
  erweitert, 
  aus 
  welcher 
  sich 
  die 
  in 
  d. 
  e. 
  /. 
  g, 
  h. 
  i. 
  dargestell- 
  

   ten 
  Knospen 
  entwickeln, 
  welche 
  der 
  Anfang 
  der 
  Seitensprossen 
  

   sind.'* 
  Structures 
  evidently 
  similar 
  to 
  those 
  figured 
  by 
  Kiitzing 
  

   occur 
  in 
  at 
  least 
  four 
  of 
  the 
  West 
  Indian 
  species 
  of 
  Liagora 
  (L. 
  

   ceraiioides, 
  L. 
  valida, 
  L. 
  fariitosa, 
  and 
  L. 
  pinnata), 
  which 
  often 
  

   show 
  small 
  flat 
  orbicular 
  discs 
  lying 
  on 
  the 
  general 
  surface 
  of 
  the 
  

   plant 
  or 
  somewhat 
  immersed 
  among 
  the 
  assimilatory 
  filaments. 
  

   These 
  discs 
  are 
  of 
  a 
  deeper 
  red 
  color 
  than 
  the 
  main 
  Liagora 
  plant. 
  

  

  from 
  

  

  latory 
  

  

  bear 
  on 
  their 
  dorsal 
  (distal) 
  surface 
  a 
  few 
  sporangia, 
  the 
  contents 
  

   of 
  which 
  remain 
  undivided, 
  so 
  that 
  they 
  may 
  referred 
  to 
  as 
  mono- 
  

   sporangia. 
  Long, 
  colorless, 
  gelatinizing 
  hairs 
  may 
  usually 
  be 
  

   seen, 
  arising 
  from 
  this 
  outer 
  or 
  dorsal 
  surface. 
  The 
  disc 
  is 
  in- 
  

   volved 
  in 
  mucus, 
  the 
  outer 
  limits 
  of 
  which 
  may 
  be 
  distinct 
  or 
  may 
  

   be 
  vague 
  or 
  imperceptible. 
  Except 
  in 
  the 
  youngest 
  parts 
  of 
  the 
  

   Liagora, 
  this 
  mucous 
  envelope 
  is 
  more 
  or 
  less 
  calcified. 
  These 
  

  

  